Lando Norris has taken to the track in the new McLaren MCL35M that was launched on Monday evening.
The MCL35M is McLaren's first car since renewing its partnership with power unit supplier Mercedes after six-years apart and Norris was the first to sample new machinery.
Ricciardo will sample the MCL35M for the first time later today as McLaren begins to step up its preparations for pre-season testing and the first race of the season, both of which will take place in Bahrain.
With Renault power last year, McLaren finished third in the constructors' championship standings, winning out in a season-long three-way duel with Racing Point and Renault - teams that this year will be known as Aston Martin and Alpine.